[Nemo]

STEP files don't have materials selected, either, so you have to go in and tell each part that it's made of aluminum or steel or whatever if you want to use it for weight and CoG later on.

Last summer I went through a process of creating all of my own AndyMark gearbox assemblies with the constraints the way I liked them, colors adjusted, materials entered, etc. I imagine that I'll be doing something similar over winter break with the Vex Pro stuff. It's nice to have an organized library of COTS parts.